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Anonymous
Anonymous asked in 科學其他:科學 · 1 decade ago

請問物理學上的envelope是什麼意思?及相關問題

這句話不懂

A slowly of the oscillation line that provides a border to a rapid oscillation is called envelope of the oscillations.

這是在damped oscillations那邊的部分,前面提到波形位置方程式,後面還牽扯time constant,實在不知envelope和border是什麼東西?是要描述什麼?圖嗎?請以非翻譯機的方式清楚作答

Update:

請問:你的意思是說envelope就是說圖上的振盪將它拆開後的各別振盪嗎?也就是說,這是由其它振盪所合成的

1 Answer

Rating
  • ?
    Lv 7
    1 decade ago
    Favorite Answer

    請看下圖的例子,damping後的振蕩,如果將各個振蕩的外緣(boarder,指波峰)連接起來,可以用假想的曲線表示。這條曲線,就是內含各別振蕩的envelope(英文有封套、包含的意思),曲線方程式中可得出time constant。

    圖片參考:http://physics.ucsd.edu/students/courses/fall2002/...

    2008-07-17 00:41:16 補充:

    是指連接各波峰的虛線。要是你把時間軸壓縮,各別的振蕩會看不見,只可見「包含」所有振蕩的envelop,所以這麼叫。

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